linux下载网址
kali linux
https://www.kali.org/downloads/
centos linux
http://isoredirect.centos.org/centos/8/isos/x86_64/CentOS-8.1.1911-x86_64-dvd1.iso
ubuntu linux
https://www.ubuntu.org.cn/download
红帽
https://www.redhat.com/zh/technologies/linux-platforms/enterprise-linux